Answer:
42.3moles
Explanation:
The chemical equation given in this question is as follows:
H2 + O2 → H2O
However, this equation is unbalanced, the balanced chemical equation is as follows:
2H2 + O2 → 2H2O
This equation shows that;
2 moles of hydrogen gas (H2) will produce 2 moles of water (H2O)
Hence, If 42.3 moles of water (H2O) are produced, 42.3 × 2/2
= 42.3moles of hydrogen was reacted.
Which is one factor that increases the speed of a sound wave? A. higher temperature B. lower temperature C. traveling in a liquid rather than a solid D. traveling in a gas rather than a liquid
Answer: c
Explanation:
Science has had no negative impacts on society. Please select the best answer from the choices provided T F
Answer:
false
Explanation:
not all science is good, or has good effects
False.
Science can possibly be dangerous when used by the wrong people. It can be used to create bombs, bioweapons, and much more.
Please mark Brainliest if this was helpful, and let me know if you have questions! :)
Calculate the amount in grams in 0.52600 moles of vanadium.
Answer:
26.795229
Explanation:
This is how much it is
Even when an object appears to be at rest, its atoms and molecules are in constant motion
A.true
B.false
(6th-grade science please help)
Answer:
the answer is True
Explanation:
the answer is True
How could the age be interpreted in a rock in which the blocking temperature has been reached?
Questions
1. Is the statement true that a gas takes on the shape of the container?
2. What happened to the water when it was poured into the glass? Into the square container?
3. Did the wood have a fixed shape?
4. Of what state of matter is water an example?
5. Of what state of matter is
ice an example?
6. Of what state of matter is steam an example?
This is for a project. Complete in complete sentences. Please. Sorry if this is confusing
Answer:
1. It will take the shape of its container. Particles can move about within a liquid, but they are packed densely enough that volume is maintained. Gaseous matter is composed of particles packed so loosely that it has neither a defined shape nor a defined volume. A gas can be compressed
2. However after pouring the water from one short glass into a tall glass, to be the same amount after being poured into any other container
3. Yes, wood have a fixed shape. Explaination: The reason is that it's solid and solids have a definite volume and shape. ... They have shapes that do not change and volumes that can be measured
4. Water is known to exist in three different states; as a solid, liquid or gas. Clouds, snow, and rain are all made of up of some form of water. A cloud is comprised of tiny water droplets and/or ice crystals, a snowflake is an aggregate of many ice crystals, and rain is just liquid water
5. Solids are sometimes formed when liquids or gases are cooled; ice is an example of a cooled liquid which has become solid. Other examples of solids include wood, metal, and rock at room temperature
6. For example, water commonly exists in three states of matter: solid (ice), liquid (water), and gas (steam)
Explanation:
plzzzzzzzzzzzzzz give brainly
1. It will adopt its container's shape. Within a liquid, particles can move around, yet the volume is maintained because of the liquid's dense packing. Particles in gaseous stuff are arranged so haphazardly that neither their shape nor their volume can be determined.
What is liquid ?The term liquid is defined as substance which is not solid but which flows and can be poured and take a shape of container. water is an example of liquid.
2. However, the same amount of water would be poured into any other container after being transferred from one short glass to a tall glass.
3. The shape of wood is fixed. It's solid, and solids have a distinct volume and shape, which explains why. They have measurements-able volumes and unchanging forms.
4. There are three recognized states of water: solid, liquid, and gas. Snow, rain, and clouds are all composed of water in some way. A snowflake is an accumulation of several ice crystals, a cloud is made up of microscopic water droplets and/or ice crystals, and rain is just liquid water.
5. When liquids or gases are chilled, solids can occasionally form; ice is an example of a cooled liquid that has solidified. At room temperature, solids also include wood, metal, and rock.
6. As an illustration, water typically exists in three states: solid (ice), liquid (water), and gas (steam).
Thus, to learn more about liquid, follow the link;
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Gas A has a partial pressure of 6 atm. Gas B has a partial pressure of 2 atm.
What is the partial pressure of Gas C, if the total pressure of the combined
gases is 10 atm?
Answer:
2 atm
Explanation: add both partial pressures and subtract from total pressure
5.14 x 1023 ions NaCl to Moles
Answer:
2 moles
Explanation:
For a mole NaCi, we have a mole of sodium ion and a mole of chloride.
A sample of gas at 62.0°C occupies a volume of 4.80 L at a pressure of 2.90 atm. How many
moles of gas are contained in the sample?
Answer: 37.01 moles (mol) of gas
Explanation:Use PV=nRT
which is also equal to n=PV/RT
P=2.90
V= 4.80
R = 8.31 (R will always be the same in any equation)
T= 62.0
2.90 x 4.80= 13.92 / 8.31 x 62= 515.22
13.92/13.92=515.22/13.92
n= 37.01 mol
PLZ HELP I NEED THIS RN!
when the balls reach the bottom of the ramp, which statement will describe their energy?
A. they will have no kinetic energy
B. they will have 100% potential energy
C. they will have 100% kinetic energy
C. they will have different amounts of potential energy
Answer:
they will have 100% kinetic energy
Explanation:
all the potential energy has been used when it is at the bottom of the ramp
what is the only thing in nature that can be a solid,liquid,or gas?
A.water
B.hydrogen
C.helium
D.oxygen
pls answer will give brainliest
Answer:
A. Water
Explanation:
Virtually every known substance can be referred to as MATTER, as long as it has weight and occupies space. Matter can exists in three different forms namely: solid, liquid and gaseous states.
However, each state of matter has its own unique property that characterizes it. WATER is the only matter that can exists in the three different states as follows:
- LIQUID - WATER
- SOLID - ICE
- GASEOUS - STEAM OR VAPOUR.
What does (endangered wildlife) mean ?
Answer:
Hey mate....
Explanation:
This is ur answer.....
A species considered to be facing a very high risk of extinction in the wild.
Hope it helps you,
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FOLLOW ME! :)
Answer:
It means when a species in the wildlife is in danger or close to being completely extinct.
How many electrons can beryllium lend
Answer:
2 because it has two outer shell electrons out of 8 (relevant rule only for the first 20 elements)
define saturated and unsaturated fats
Answer:
SATURATED: Saturated fat is a type of fat in which the fatty acid chains have all or predominantly single bonds.
UNSATURATED: Unsaturated fats are loosely packed. They tend to be liquid at room temperature.
There are two main types of unsaturated fat:
Monounsaturated
Polyunsaturated
A paracetamol tablet was crushed and an excess of HCl 25cm³ of 1.0mol was added. the result of the solution was titrate against 0.5mol of NaOH. calculate the mass of CaCO3 in the paracetamol.
Answer:
1.35g of CaCO₃ are in the paracetamol
Explanation:
Assuming the volume of the 0.5mol NaOH was 23cm³
The CaCO₃ of paracetamol reacts with HCl as follows:
CaCO₃ + 2HCl → CO₂ + H₂O + CaCl₂
When an excess of HCl is added and titrated, we can find the moles of HCl that react = Moles CaCO₃ based on the second reaction:
NaOH + HCl → H₂O + NaCl
Moles added of NaOH:
23cm³ = 0.023L * (0.5mol / L) = 0.0115 moles NaOH = Moles HCl in excess
Moles of HCl:
25cm³ = 0.025L * (1.0mol / L) = 0.025 moles HCl
The moles of HCl that reacted = Moles CaCO₃ are:
0.025 moles - 0.115 moles = 0.0135 moles CaCO₃
The mass of CaCO₃ -Molar mass: 100.09g/mol- is:
0.0135 moles CaCO₃ * (100.09g/mol) =
1.35g of CaCO₃ are in the paracetamolWhich of the following models a synthesis reaction?
Answer: D
Explanation: i’m right
Copper has two isotopes,
copper-63 and copper-65. It has an atomic mass of 63.546 amu. Sketch a pie graph that shows the approximate abundance of each
copper isotope based on the atomic mass?
Answer:
69.152 % → 63Cu
30.848 % → 65Cu
Explanation:
As you know, the average atomic mass of an element is determined by taking the weighted average of the atomic masses of its naturally occurring isotopes.
Which of these would you expect to have the highest boiling point?
Pertane: HOC-CH2-CH-CH2-CH)
Neopentane:
H.C-C-CH3
CH3
CH,
CHE
Isopentane:
Cyclopropane
НЕС-СН-СН-СН3
Нас
CHz
a) cyclopropane
b) pentane
c) isopentane
d) neopentane
Answer:
pertane the stronger the force the larger amount of energy needed to break of the connection between the molecules
Which of the following are true about both the sun and the stars? Choose the three correct answers.
A.
Both are visible during the day in summer.
B.
Both move across the sky from east to west.
C.
Both change positions in the sky due to Earth's revolution.
D.
Both are visible at night in winter.
E.
Both appear in different positions in the sky due to Earth's rotation.
F.
Both move from north to south in the sky.
Answer:
D, F
Explanation:
Which of the following statements is
incorrect about heat and
temperature?
In which numbered position would a Period 4 element that is a metal with three valence electrons be located?
A) Position 13
B) Position 15
C) Position 20
D) Position 31
The position where a Period 4 element that is also a metal with three valence electrons would be located is: B) Position 15.
What is a periodic table?A periodic table can be defined as an organized tabular array of all the chemical elements, which is typically arranged in order of increasing atomic number or number of protons (in rows).
In Chemistry, a periodic table comprises seven (7) rows and eighteen (18) columns. Also, all chemical elements are arranged (grouped) on the periodic table based on their atomic number (number of protons).
In this context, the position where a Period 4 element that is also a metal with three valence electrons would be located is Position 15 on the periodic table.
Read more on periodic table here: https://brainly.com/question/18384230
water is a ____ molecule meaning the positive hydrogen end attracts the negative oxygen ends of another
A. balance
B.universal
C. wet
D.polar
please answer! will give brainliest
Water is a polar molecule where, the positive hydrogen end attracts the negative oxygen ends of another water molecule. Thus, option D is correct.
What is polarity ?Polarity is ability of charge separation in a molecule. In some molecules, the positive and negative ends exists separately and both ends remains reactive towards the counter charged end of other molecule.
The charge separation in molecules results in a dipole moment. Permanent dipole moment make the molecule polar. Water is a polar molecule.
The shared pair of electrons in water are more attracted towards the electronegative oxygen atom leads the charge separation. This polarity helps to the formation of strong intermolecular hydrogen bonding.
Find more on polar compounds:
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Many people wear reading glasses, which allow for better near vision.
What type of lenses are on these glasses?
Answer:
Convex
Explanation:
8 guess not sure cause light rays should be converging to meet to their eye
1. A helium-filled balloon had a volume of 8.50 L on the ground at 20.0°C and a
pressure of 750.0 Torr. After the balloon was released, it rose to an altitude where the
temperature was 40.0°C and the pressure was .550 atm. What is the new volume of
the balloon in liters at the high altitude?
Answer:
133.74 L
Explanation:
First we convert the given pressures and temperatures into atm and K, respectively:
750.0 Torr ⇒ 750/760 = 0.9868 atm20°C ⇒ 20+273.16 = 293.16 K40°C ⇒ 40+273.16 = 313.16 KThen we use the PV=nRT formula to calculate the number of moles of helium in the balloon, using the data of when it was on the ground:
0.9868 atm * 8.50 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 293.16 Kn = 2.866 molThen, knowing the value of n, we use PV=nRT once again, this time to calculate V using the data of when the balloon was high up:
0.550 atm * V = 2.866 mol * 0.082 atm·L·mol⁻¹·K⁻¹ * 313.16 KV = 133.74 LSuggest why sodium wasn’t produced until the early 19th century.
Answer:
The reason is that sodium attaches itself very strongly to other elements. Its compounds are very difficult to break apartand also because it is so reactive.
An object accelerates at 8 m/s2 when a force of 40 N is applied to it. What is the mass of the object
Answer:
f=ma
40=m*8
m=5kg
another object of same mass is added
=>m=5+5=10kg
f=10*8=80N
Explanation:
What is plotted on the Y axis
Speed
Distance or time
this is when an organism like insects or plants become trapped in amber
thats very nice lol, things stuck in amber are very cool
Help me answer this chemistry question. thank you!
Answer:
A. How much decay happens in each flashlight
Explanation:
In an experiment, the DEPENDENT OR RESPONDING VARIABLE is the variable that responds to changes being made to another variable called Independent variable. It is the variable that is measured by an experimenter.
In this question, an experiment was carried out to research the effect of sunlight on plastic decay. Three plastic flashlights were used for this experiment in which one was placed in a dark closet (control), and the others were placed in light at different times or intervals. However, the variable being measured or assessed is the decay of each flashlight. This means that "HOW MUCH DECAY HAPPENS IN EACH FLASHLIGHT" is the dependent variable.
Which statement about the atomic nucleus is correct?A.The nucleus is made of protons and has a negative charge.B.The nucleus is made of protons and neutrons and has a negative charge.C.The nucleus is made of electrons and has a negative charge.D.The nucleus is made of protons and neutrons and has a positive charge.